// The contents of this file are subject to the Mozilla Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002, 2003
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//

using namespace std;

#include <strings.h>
#include <csignal>
#include <unistd.h>

#include "parse.h"
#include "util.h"
#include "main.h"
#include "sched_util.h"
#include "server_types.h"

int debug_level = 0;

void write_log(char* p, int msg_level) {
    if (msg_level <= debug_level)
        fprintf(stderr, "%s: %s", timestamp(), p);
}

void write_pid_file(const char* filename)
{
    FILE* fpid = fopen(filename, "w");
    if (!fpid) {
        write_log("Couldn't write pid\n", MSG_NORMAL);
        return;
    }
    fprintf(fpid, "%d\n", getpid());
    fclose(fpid);
}

void set_debug_level(int new_level) {
    debug_level = new_level;
}

// sig_int will be set to true if SIGINT is caught.
bool sig_int = false;
static void sigint_handler(int)
{
    fprintf(stderr, "SIGINT\n");
    sig_int = true;
}

void install_sigint_handler()
{
    signal(SIGINT, sigint_handler);
    // SIGINT is now default again so hitting ^C again will kill the program.
}

void check_stop_trigger() {
    if (sig_int) {
        write_log("Quitting due to SIGINT\n", MSG_CRITICAL);
        exit(0);
    }
    FILE* f = fopen(STOP_TRIGGER_FILENAME, "r");
    if (f) {
        write_log("Quitting due to stop trigger\n", MSG_NORMAL);
        exit(0);
    }
}


// update an exponential average of credit per second.
//
void update_average(double credit_assigned_time, double credit, double& avg, double& avg_time) {
    time_t now = time(0);

    // decrease existing average according to how long it's been
    // since it was computed
    //
    if (avg_time) {
        double deltat = now - avg_time;
        avg *= exp(-deltat*ALPHA);
    }
    if (credit_assigned_time) {
        double deltat = now - credit_assigned_time;
        // Add (credit)/(number of days to return result) to credit, which
        // is the average number of cobblestones per day
        avg += credit/(deltat/86400);
    }
    avg_time = now;
}